Фазовая диаграмма системы H-Yb

К оглавлению: Другие диаграммы (Others phase diargams)


H-Yb (Hydrogen-Ytterbium) Editor The assessed Yb-H phase diagram has been estimated from the equilibrium hydrogen dissociation pressure measurements of [67Mes] in the composition range 0 to 64.5 at.% H and in the temperature range 600 to 750 C. Two hydrides have been reported: YbH2, in two allotropic forms, and YbH3. The b/a transformation temperature of YbH2 is 125 C [68Mes]. Crystal structure data of the equilibrium phases are from [56Kor] for aYbH2 and from [66War] for bYbH2 and YbH3. Metastable CaF2-type b›YbH2 was obtained by [68Mes] by heating aYbH2 to between ~225 and 250 C and cooling to room temperature. Another metastable form of YbH2 with an orthorhombic structure was found by [75Cur] in a thin film.-P.R.S. 56Kor: W.L. Korst and J.C. Warf, Acta Crystallogr., 9, 452-454 (1956). 66War: J.C. Warf and K.I. Hardcastle, Inorg. Chem., 5, 1736-1740 (1966). 67Mes: C.E. Messer, T.Y. Cho, and T.R.P. Gibb, Jr., J. Less-Common Met., 12, 411-418 (1967). 68Mes: C.E. Messer and P.C. Gianoukos, J. Less-Common Met., 15, 377-383 (1968). 75Cur: A.E. Curzon and O. Singh, J. Less-Common Met., 39, 227-233 (1975). 1